Ludlum Measurements 25009185, Manual

Page: 45 / 84

4.6. SETUP PAGE 1 39
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Parameters on Page 5 are not user editable using the instrument Setup Mode.
To edit these parameters, please use the Ludlum Lumic Calibration or Lumic
Datalogging Software.
4.6 Setup Page 1
Calibration Constant Mantissa - A short press of ON/ACK to select the value to adjust, and
MODE to adjust the value. Value is used with Calibration Constant Exponent to express
counts per R. Available values are:
• Ones Place (0-9)
• Tens Place (0-9)
• Hundreds Place (0-9)
Calibration Constant Exponent - A short press of ON/ACK to select the value to adjust,
and MODE to adjust the value. Value is used with Calibration Constant Mantissa to express
counts per R. Available values are:
• Ones Place (0-9)
• Tens Place (0-9)
Dead Time Correction 1 - A short press of ON/ACK to select the value to adjust, and MODE
to adjust the value. Value is in microseconds. Value should be set to zero when checking
instrument with a pulser or function generator; otherwise, higher count rates will result in
non-linearities. Available values are:
• Ones Place (0-9)
• Tens Place (0-9)
• Hundreds Place (0-9)
See the following table for examples with specific detectors.
Detector Dead Time Calibration Constant
Model 44-2 10
µ
sec ±5
µ
sec 100e+08
Model 44-6 100
µ
sec ±35
µ
sec 709e+05
Model 44-7 262
µ
sec ±35
µ
sec 139e+06
Model 44-9 85
µ
sec ±35
µ
sec 200e+06
Model 44-38 100
µ
sec ±35
µ
sec 709e+05
Table 4.2: Dead Time and Calibration Constant
December 2021